One canopy with a film that transmits roughly 33% blue light (wavelength range: 400 to 520 nm) will be used
during sunny periods of a day. Another canopy with a film that transmits about 79% blue light will be used during
overcast periods of the day. The infants will be moved from one canopy to the other as needed during the day with
the goal of keeping the blue light irradiance level above 8 μW/cm2
/nm.